And do not shoot for teen/school/training oriented, seems the masses are teen/schooled out, lesson learned.
I love the idea, cold storage, group politics, threats and exploration. Just before we tried Rise of Legends/Ephermeris Erudition, we'd discussed a similar original sci-fi idea. It was cold storage concept like you have there, but it wasn't random people. It was famous historical figures waking up and having to figure out where they were. It included a wall around the city to protect from others (similar to the alien threat you have up there), something like Wayward Pines. The historical figures sounded fun. Instead of Joe the Engineer pondering how to fix generators after mad Tim blew it up, would of been like Alexander Graham Bell arguing Kalpana Chawla on how best to conserve resources and provide sufficient energy or something. And they didn't die, they were preserved for mysterious reasons or something, part of the meta was figuring that out and then having to deal with the 'new world' and other threats/reason for that wall. CG would of been very easy, chars could be stated, but BG could of just pointed at wikipedia. We thought to make everything else secretive and allow the theme files and wiki to develop more as it was discovered rather than all up front. We vested more in the secretive expansion idea but then decided too much OOC playgroups would share info off site with friends rather than discovering as community build/exploration.
That's to say, go original. For the reasons mentioned and for some of us, we don't have the time to get detailed in franchise/canon things; like KOTOR SW, it sounds fun but I wouldn't play because too many others know the canon and I don't want to read a ton to catch up.